My two girls have been happily living in a 2x3 C&C, with an upper loft, for almost two years now. They are close friends, but if the need for more space ever arises, I can easily expand their cage using extra cubes and coroplast.

In 2006, I was fortunate to find two boxes of mini-grids at Bed, Bath, and Beyond when I started to build the girls' cage.

I used many of these small grids for building the ramp. I used coroplast to line it, but did not zip-tie it to the grids; instead, I attached the ramp and the coroplast to the upper level separately. Both the ramp and the coroplast liner can move up and down, as needed, for easy cleaning.

A plastic "S-hook" secures the ramp to the side of the cage, so there is no swaying.

I sewed Velcro to my fleece pads and the Sherpa fleece ramp covering, so that everything stays in place while the guinea pigs are dashing up and down their ramp.

The bin was just the perfect size to fit a 1-grid-wide hayloft. It was filled with Carefresh, and changed daily. The hayrack hung over the grids above the bin. One guinea pig would relax in the bin, munching hay, and the other would lounge on the outside, next to the bin.